Sahih al-Bukhari
Sahih al-Bukhari 4506
"So whoever of you sights (the crescent on the first night of) the month (of Ramadan, i.e., is present at his home), he must observe Saum (fast) that month... (V.2:185)
Arabic hadith text
حَدَّثَنَا عَيَّاشُ بْنُ الْوَلِيدِ، حَدَّثَنَا عَبْدُ الأَعْلَى، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـأَنَّهُ قَرَأَ {فِدْيَةٌ طَعَامُ مَسَاكِينَ} قَالَ هِيَ مَنْسُوخَةٌ.
Translation
Narrated Nafi`
Ibn `Umar recited: "They had a choice, either fast or feed a poor for every day.." and added, "This Verse is abrogated."